I've had zero success retracting my rear right piston on a Mini Cooper S. Just pressing on the piston does not seem to be sufficient. I've seen other forums discuss the requirement to rotate the piston as well as compress it. If that is indeed a necessary step, it would be a good thing to add to the instructions.

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You do have to rotate the piston with a special tool. I will have this step added to the tech article. Thanks for the feedback.

- Nick